Within days of the 9/11 attacks in New York City, Brian Cury installed a webcam at the site. He wanted the families of victims — and the world, he says — to witness the brave determination of first responders working at what became known as Ground Zero.

In the weeks, months and years that followed, Cury, the founder and CEO of EarthCam, added more cameras that documented the rebuilding of the site and construction of the National 9/11 Memorial Museum.